Information sources in politics and political science : a survey worldwide
editors, Dermot Englefield, Gavin Drewry
Butterworth, 1984
 Buku Referensi
Prytherch, Ray
Sources of information in librarianship and information science
Gower, 1987
 Buku Referensi
Parker, Christopher Charles
Information sources in science and technology : a practical guide to traditional and online use
Butterworths, 1960
 Buku Teks SO
Information sources in patents
edited by C.P. Ager
Bowker-Saur, 1992
 Buku Referensi
Information sources in the medical sciences
editors, L.T. Morton, S. Godbolt
Butterworth, 1984
 Buku Referensi